The numerical simulation, design, and construction of a double glazed integrated collector storag... more The numerical simulation, design, and construction of a double glazed integrated collector storage (ICS) with compound parabolic concentrators (CPC) reflectors are presented. The design of the double glazing is optimized by means of numerical simulations under Tunisian climatic conditions. The numerical program used for the simulation consists on the transient resolution of the balance energy equations of each component of the solar water heater. Different proposed models of a double glazing are studied and compared with a reference case of a single glass ICS model. The simulation results have shown that the use of double glazing with argon layer and low-e coated lower glass instead of one glass cover significantly improves the thermal behavior of the ICS heater and visibly reduces its thermal losses during night. Taking into account these numerical results, a double-glazing ICS prototype-collector is constructed. The details of the construction, geometry, optical properties, and di...
ABSTRACT Aiming at developing a decision aid tool for double-skin façades (DSF) design in the Med... more ABSTRACT Aiming at developing a decision aid tool for double-skin façades (DSF) design in the Mediterranean climate, this study has coupled CONTAM with TRNSYS to evaluate the thermal/ventilation performance of the façade under dynamic climatic conditions. Similar coupling thermal building simulations to nodal airflow network simulations have been performed in DSF modelling; but in all cases, it was used to get an overall evaluation of the DSF behaviour, whereas, in this paper, temporal distribution of temperatures into the cavity is presented, relating more accurately the transient heat and mass transfer in the DSF. Reproducing a configuration of single storey naturally ventilated DSF reveals a good agreement between simulation results and measured data from full-scale experimentation in both winter and summer time. The 3D radiation model implemented in the last version of TRNSYS, provided with the detailed solar characteristics of glazing in the different layers of the DSF, well estimates the heat transfer into the cavity in interaction with the adjacent zones. Natural ventilation is obtained, using CONTAM, by means of internal airflow paths running through the DSF height.
Résumé -Connaître les performances et identifier les paramètres d'un chauffe eau solaire s... more Résumé -Connaître les performances et identifier les paramètres d'un chauffe eau solaire s'avère nécessaire pour améliorer sa qualité et par suite garantir à l'utilisateur le confort dont il est habitué avec les autres types d'énergies épuisables. Pour cette raison, on a besoin d'une méthode de test fiable et reproductible et au même temps peu coûteuse du point de vue argent et temps. Dans ce qui suit, deux méthodes de test seront présentées à savoir la DST (ISO/DIS9459-5) et l'Input-Output (ISO/DIS9459-2). Ce sont deux méthodes en boîte noire dont le test se passe à l'extérieur sous des conditions climatiques réelles avec des profils de soutirages différents afin d'approcher le maximum le fonctionnement réel. Mots clés: Chauffe eau solaire -Test en boîte noire -Identification des paramètres -Test dynamique -Input-Output.
The numerical simulation, design, and construction of a double glazed integrated collector storag... more The numerical simulation, design, and construction of a double glazed integrated collector storage (ICS) with compound parabolic concentrators (CPC) reflectors are presented. The design of the double glazing is optimized by means of numerical simulations under Tunisian climatic conditions. The numerical program used for the simulation consists on the transient resolution of the balance energy equations of each component of the solar water heater. Different proposed models of a double glazing are studied and compared with a reference case of a single glass ICS model. The simulation results have shown that the use of double glazing with argon layer and low-e coated lower glass instead of one glass cover significantly improves the thermal behavior of the ICS heater and visibly reduces its thermal losses during night. Taking into account these numerical results, a double-glazing ICS prototype-collector is constructed. The details of the construction, geometry, optical properties, and di...
ABSTRACT Aiming at developing a decision aid tool for double-skin façades (DSF) design in the Med... more ABSTRACT Aiming at developing a decision aid tool for double-skin façades (DSF) design in the Mediterranean climate, this study has coupled CONTAM with TRNSYS to evaluate the thermal/ventilation performance of the façade under dynamic climatic conditions. Similar coupling thermal building simulations to nodal airflow network simulations have been performed in DSF modelling; but in all cases, it was used to get an overall evaluation of the DSF behaviour, whereas, in this paper, temporal distribution of temperatures into the cavity is presented, relating more accurately the transient heat and mass transfer in the DSF. Reproducing a configuration of single storey naturally ventilated DSF reveals a good agreement between simulation results and measured data from full-scale experimentation in both winter and summer time. The 3D radiation model implemented in the last version of TRNSYS, provided with the detailed solar characteristics of glazing in the different layers of the DSF, well estimates the heat transfer into the cavity in interaction with the adjacent zones. Natural ventilation is obtained, using CONTAM, by means of internal airflow paths running through the DSF height.
Résumé -Connaître les performances et identifier les paramètres d'un chauffe eau solaire s... more Résumé -Connaître les performances et identifier les paramètres d'un chauffe eau solaire s'avère nécessaire pour améliorer sa qualité et par suite garantir à l'utilisateur le confort dont il est habitué avec les autres types d'énergies épuisables. Pour cette raison, on a besoin d'une méthode de test fiable et reproductible et au même temps peu coûteuse du point de vue argent et temps. Dans ce qui suit, deux méthodes de test seront présentées à savoir la DST (ISO/DIS9459-5) et l'Input-Output (ISO/DIS9459-2). Ce sont deux méthodes en boîte noire dont le test se passe à l'extérieur sous des conditions climatiques réelles avec des profils de soutirages différents afin d'approcher le maximum le fonctionnement réel. Mots clés: Chauffe eau solaire -Test en boîte noire -Identification des paramètres -Test dynamique -Input-Output.
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